Mounting for rock drills



24 SHEETS-SHEET l G. M. DICK MOUNTING FOR ROCK DRILLS Nov. 4, 1952 Filed June 9, 1949 G. M. DICK MOUNTING FOR ROCK DRILLS Nov. 4, 1952 2 SHEETS-SHEET 2 Filed June 9, 1949 HIS ATTORNEY.

Patented Nov. 4, 1952 UNITED sr61rlfsv PATENT l OFFICE 2,616,667 f u i lVIOUlWIIN.(3v ROR ,DLJE George M.Dick, Sherbrooke, Quebec, Canada, as-

signor to Ingersoll-Rand Company, New York,

Y., a' corpora-tion'of New .jersey v Application. June 9.. 1949, Serial N6 9&.0115

rock drilling tools ofthe drifter type commonlyused for drilling holes in thevertical .wallsof tunnels .and the like.

One object of the .invention is to enable the rock drilling tool tojbe conveniently and quickly placed ina desired drilling position.

Another .object to ,enable the rock vdrilling tool .to be expeditiously placed in a variety of positions along a workingfsurface from a given setting of the mounting andwith a minimum-oi eiorton the partof .the operator.

further object, is to assure a rigid support for the rock drilling tool.`

Other objects will be in part obvious and in part pointed .out hereinafter. u y

I'n'the drawings accompanying this` specification and in which lsimilar reference numerals refer to. similar parts,

Figure 1 isa side elevatiom partly broken away, of a,nrionnting constructed in accordance with the practice of the invention,

Figure 2 is aplan view of the mounting,

Figure is 1a transverse view taken through Figure 1 on the line 3 3.,

.iigure 4; isa similar view taken on the line 4-4 through Figure 2'looking vin the direction indicatedby the arrows,

Figures .5- ando are. transverse views taken through Figure-1 on the lines 5-5 and 6-6, ,respectively, t

Figure '7 -is Ea. longitudinal view, in section, oiy the -11lI1Y1DI -1.g mechanism servingto supply iiuid to var-'ous fluid actuated .parts of the mounting,

Figuref 4is an elevation, Vpartly broken away, ofgthetrailing `'end portion vof the mounting,

Figure p9 lis a side .view of the free end portion of ga tool-supporting arm or -boom of themounting showy-ing a rock drilling tool mounted thereon, and

Figure-10 is an elevation, partly in section, of a detail taken through Figure 2 on the line {0f-I0.

Referring more particularly to Vthe drawings, the mounting, designated in `general bym), comprises amain .frame l2| "and a supporting mecha,- nism :Z2 :mounted .adjustably on the main frame to support .a-rocl; drill123 Vand positioned correctly with'lrespect -to the'working surface.

in order to render .the mounting V20 readily portan@ the main frame -21 .is .provided with wheels 24 shown asbeng intended for use on .a steel track. The :wheels 24 are located near the endscf the main iframe, and on the lupper surface of `the main frameand nearoneendthereof ist, jack 25 for engagementwith the ,surface 26 1 claim. (o1. Z55-51) overlying the mounting prevent tilting thereof.

The jack .25 comprises a cylinder 2] 'whichrests upon the 'main frame 2| and contains a re'- ciprocatory .piston 28 a rod 29 of which extends through the upper end of the cylinder 2l and has teeth 30 fo'rengagement with the .surface'ZBL The piston.` 28 is .hydraul-icallyactuatd `for pressing the teeth 30 against thesurfaoel 26 and the Supply of fluid serving this .rilirrfiose is "f trolledV by a Valve mechanism,A ldesignatedln. its entirety by 3 I and conveniently located .adjacent the jack 25. The valve mechanism?! comp s al .chest 32 having a pair of valve chamber 533 arid' .34 .contamina respectively, .Semis-pressed poppet valves 35v and 3.6 the stems :31er which project .from ,the upper end of vthe chest 32 flfofr engagementlwith the opposed ends of rockerfBfB arranged in .Qa slot .39 in thevalve chest` 321. A pin seated at its tends in the valve chest .3,2 and extending through the mid portiQrl of the .rocker 38 serves as apivdt'thcrefor, and on the upper surface of the rocker, adjacent the pin .4,1 is .a leverll formanually moving the rocker .3,8 `to its diierent controlling positions. 'f

The valve v,36 serves to A'control the flowof pres-f sure vfluid into the lower end of .the cylinder 21 and the .valve 35 controls the exhaustI of such uid from :the cylinder. The valve chest 3'2 is accordingly'. provided with a .pressure'iuid sup? ply cnduit' ,.42 which communicates with the valve chamber 3l! througha passage 43 a portion of which 'encircles thestem 3l of the valve .3.6. A .passage ,4.4, similarly 4arranged'with respectfto the stem 31 of the valve 3.5, `.conveys fluid from the valve chamber v33 to .a ,discharge .conduitfd leading to a supply reservoir 46 locatedl on .the under-side of the main frame 2|. The iiuid admitted into the valve chamber 34 by thevalve 3.6 passes. into the lower end of the cylinder 2l through a conduit klil and through a cdnnection 48 attached to the lower end of `the cylinder 21,

land such iiuid is exhausted from the cylinder into the valve chamber 33 through the connection;4, 8 and a conduit-49. L

Thus, as will be readily understood, whenever it is intended to extend'the jack 2,5, for pressing the teeth 30 againstthe surface 26, rthe'lever ,'41 is tilted to unseat the valve 36. Pressure iiuid will then flow through the v alve chamber 34,' the conduit 41 and the connection '43 'beneath the piston 23 and move the piston upwardly;I A-nd whenever it is intended to lower the piston 28 the lever is tilted in the opposite direction to unseatthe lvalve 35. The pressure fluid Ibeneath the Apiston 28 will then .escape through the Aconnection V48, conduit 49 and through vthe valve chamber 33 and associated channels into the supply reservoir 46.

In the preferred form shown, the supporting mechanism 22 comprises a two-piece boom 50 that is pivoted at one end, for movement in a vertical plane, on a pin 5| in the upper end of a support member 52 encircling an upright cylindrical bearing/member or post 53 seated upon the main frame 2|. The bearing member 52 is freely rotatable about the post 53 and carries a key in the form of a screw 54 which projects into an annular groove 55 in the upper portion of the post 53 for retaining the support member upon the post.

In order to selectively arrest rotational movement of the support member 52 with respect to the post 53, said support member is provided with a braking device comprising a splitl brake band 56 which may be of conventional form and carries the usual brake shoes 51` for engagement with the inner surface 58 of a skirt 59 on the lower end of the support member 52. The brake band 56 thus encircles the post 53 and may be secured against rotary movement with respect thereto. To this end the brake band 56 is provided with a pair of lugs 20|. Each lug is provided with an enlarged slot 203 which fits over a pin 202 secured to the base plate 204 of the post 53. The brake band is, therefore, free to move outwardly against the braking surface 58 but is secured against rotation by the pins within the slots of the lugs 20|.

The application and the release of the brake to and from the surface 58 is effected by an actuator, designated in its entirety by 60, and actuated by pressure fluid. The actuator comprises a casing 6| (see Fig. 6) which is recessed to provide a piston chamber 62 for the accommodation of a reciprocatory piston 63 that is actuated by pressure fluid delivered to the piston chamber by a supply conduit 64. The piston 63 carries a rod 55 which as shown in Fig. 3 extends through the opposite end of the casing 6| and has threadedly connected thereto a clevis 66 which is pivotall'y connected to an end of a rocker 61 the opposite end of which carries a spreader 68 that lies between the opposed ends 69 of the brake band 56. The spreader 68 is of oval shape so that when it is rotated by the piston 53 it will rollover the opposed end surfaces of the brake band 56 and cause the brake shoes 51 to be pressed into frictional engagement with the surface 58. The actuator 60 is secured in the correct assembled relationship with respect to the rocker 61 by bolts 10 extending through the casing 8| for threaded engagement with the main frame 2|.

The tilting ofthe boom 50 about the pivot 5| is also effected by pressure fluid and the boom 50 is accordingly provided, near its outer free end, with depending lugs 1| to support a pin '|2 that serves as a pivot for an end of a cylinder 13 into which extends a plunger 14 pivoted upon a pin 15 seated in lugs 16 on the outer surface of the skirt 59. Pressure fluid is conveyed to and from the cylinder 13 by a conduit 11 leading from a casing 18 containing valve devices for controlling the flow of pressure fluid to and from both the actuator 60 and the cylinder 13.

The casing 18 is located at the free end of the boom 50 where it may be conveniently reached by the operator from his station adjacent the rock drill 23. The casing 18 may be secured to the boom 50 in any suitable manner and its interior is recessed to provide a supply chamber 'I9 l chamber through ports 85 and open, respectively,

into passages 86 and 81 that communicate with the conduits 64 and 11, respectively. The casing 18 is further provided with discharge valve chambers 88 and 89 that also open into the passages 86 and 81, respectively, and communicate with the discharge chamber 8| through ports 90.

Communication between the supply chamber 19 and the inlet valve chambers 83-84 and between the discharge valve chambers 88--89 and the discharge chamber 8| is controlled by springpressed valves of the type controlling the supply of pressure fluid to the jack 25. Thus, a poppet valve 9| controls communication between the valve chamber 84 and the supply chamber 19, and a similar valve 92 controls communication vbetween the valve chamber 89 and the discharge chamber 8|. Both valves are spring-pressed for normally retaining them on their seats. stems 93 extend through the ports 85 into a recess 94 in the casing 18 for engagement with'the end portions of a rocker 95 secured at its intermediate portion to a shaft 96 extending through the recess 04 to the exterior of the casing 18 for connection with a lever 91 whereby the rocker 95 may be manipulated for unseating the valves.

Similarly, communication between the supply chamber 19 and the valve chamber 83 and between the valve chamber 88 and the discharge chamber 8| is controlled by spring-pressed poppet valves 98 and 99, respectively. The stems |00 of the valves 98-99 extend through the adjacent ports and 90 into the recess 94 for engagement with the end portions of a rocker |0| having its shaft |96 extending exteriorly of the casing 18 for the reception of a lever |02 whereby the rocker |0| may be manipulated.

As will be readily understood from the foregoing description, by thus grouping the control valves for the braking device and the cylinder 13 and positioning them at the end of the boom50 they will be within easy reach from the position which an operator must normally occupy for manipulating the power controlling elements of the rock drill 23. From this position it will, therefore, be possible for one attendant to conveniently control the operation of the rock drill, to retard or arrest rotative movement of the boom about the axis of the post 53 and to readily effect the raising and the lowering of the boom for positioning the rock drill 23 at desired points along a working surface.

'Io the end that the rock drill 23 may be conveniently positioned for drilling a series of holes 1n a horizontal plane, the boom is provided with a support arm |03 which has a clamp |04 at one end to grip a vertical, fixed pin |05 in the free end of the boom 50. Thus, by releasing the clamp |04, whenever required, the support arm |03 may be turned about the pin |05 to swing the rock drill 23 through a horizontal plane along a rock surface. In order to further facilitate the positioning of the rock drill with respect to the work a bar |06 is attached to the free end of the arm |03 for supporting the rock drill 23. The bar is Their 5 attached tothe arm |03 by means of a clamp |0 1 of awell known type permitting the bar to be swung about the support arm, and the rock drill 23 is secured to the bar |06 by a clamping device |08. The pressure fluid supply, compressed air for example, serving to operate the rock drill is conveyed thereto by a conduit |09 attached to a supply line I| leading from a suitable source of supply (not shown).

The pressure fluid serving to operate the various fluid actuated devices thus far described, other than the rock drill 23, preferably consists of a liquid under pressure, as for example oil, and is supplied .to such devices by a pump I I mounted upon themain frame 2 I. The pump I I I is shown as being of the gear type and has its inlet opening ||2 in' communication with the reservoir 46 through a conduit ||3 having a valve ||4 interposed therein forselectively cutting off communivcationbetween the reservoir and the pump. -A

discharge conduit I I5 connected to the discharge open-ing ||6 of the pump is in con-stant communication with the conduit 42 and with the supply` conduit 80 leading to the supply chamber 19 of the control valve mechanism on the boom 50.

The driver for the pump prefer-ably consists of a pressure fluid 4actuated motor |I1, the casing I|8 of which may be connected directly to the pump in any well known manner. The motor I1 is of the slidable vane type, and its rotor I I9 has an axial extension |20 in too-thed engagement with a pinion |2| keyed to a shaft |22 on one o-f the gears |23 of the pump III. The motor I I1 has the usual inlet and exhaust passages |24 and |25 and is equipped with a suitable governing device |26 for controlling its speed.

The governing device |26 comprises a springopposed reciprocatory valve |21 fo-r controlling the flow of pressure fluid from a supply port |28, in the end of the motor casing IIB, to the inlet pas-sage |24 and in the end of the rotor ||9, adjacent the valve |21, is a governor |29 having a weight-actuated, spring-opposed plunger element |30 to engage a stem I3| on the Valve |21 for shifting said valve to its controlling positions.

Additional mean-s are provided for controlling the operation of the motor, more particularly to cut oi the power supply to the motor when the pressure required for operating the various hydraulically :actuated devices reaches a predetermined maximum value and to again cause operation of the motor |1 when the hydraulic pressure falls to a predetermined minimum value. To this end, a valve mechanism |32 is threadedly connected to the portion of the motor casing |8 dening the supply passage |28, and within said casing is Ia supply chamber |33 that communicates through a port, or ports, |34 with a conduit |35 leading from the supply line I0.

The supply chamber |33 opens into a valve chamber |36 that communicates with the supply passage |28, an-d communication between the chambers |33 and |36 is controlled by a ball valve |31. The force serving to move the valve |31 to and hold it in its closed position is transmitted to the valve by a plunger |38 which abuts at one end against the valve |31 and extends into a chamber |39 in the valve mechanism |32 so that its end surface |40 will be subjected to the pressure of the fluid within the chamber |39, such uid being conveyed to the valve mechanism by a branch |4I leading from the discharge conduit ||5ofthepump The admission of p-ressure fluid into the chamber |39 is controlled by a ball valve |42 that .con-

tlOlS the port |43 into which the conduit |4| opens. The valve |42 is unseated by the .pressure of the .Huid in the port |43 and the value of the pressure at which the valve |42 is unseated is controlled by a, lspring |44 seating at one end against an adjustable spring seat |45 and .at its other end against a spring seat |46 resting upon a rod |41 that seats upon the ball |42.

Adjustment of the spring seat |45 is effected by.

a screw |48 extending through an outer Wall of the valve mechanism |32 to bear against the valve in its closedposition until the pressure,

within the discharge conduit I|5 and associated conduits reaches the predetermined maximum value. .When the discharge pressure of the pump reaches this value the spring |44 will yield to its pressure and permit the valve |42 to move to its open position. Pressure fluid will then iiow from the port |43 into the chamber |39 against the surface |40 of the plunger |38 and move the valve |31 against the outlet end of the chamber |33, thereby cutting off the flow of compressed air to the motor 1.

When the pressure within the discharge conduit I|5 and the associated conduits again dro-ps to a predetermined minimum value the pressure of the spring |44 will restore the valve |42 to its closed position and the pressure of the fluid within the chamber |33 acting against the rball valve |31 will unseat said valve to again admit pressure fluid t-o the motor I I1 for operating the pump to again build up the hydraulic pressure for the braking and other hydraulically actuated devices to the predetermined maximum value.

As may be readily appreciated, it may be desirable at times to utilize the hydraulically actuated devices under circumstances when it is in- Iconvenient to operate the pump and before connections are completed between the motor ||1 and the source of pressure fluid supply depended upon for operating it. One such example would be the application of Ithe braking device for preventing rotative movement of the supporting member 52 relatively to the po-st 53 during the transport-ation of the mounting from on-e drilling site to another. To this end a hand-operated pump |49, and which may be of any well known type, is installed on the main fram-e with its inlet conduit |50 extending into the reservoir 46 Iand its discharge conduit |5| opening into the conduit |I5 of the pump ||I. Owing to this arrangement, pressure iuid may be conveniently supplied to the several hydraulically actuated devices of the mounting by manual oper-ati-on of the pump |49 even though pressure iiuid suitable for operation of the motor ||1 is unavailable.

As a preferred arrangement, the mounting is provided at one end with an extension |52 which is divided interiorly into compartments |53 for tools and supplies. rihe extension |52 is hinged on a pin |54 on the upper surface of the main frame 2| so that it may be raised to an upright position for transportation. By thus arranging the extension |52 the shipping space required for the mounitng need be only slightly greater than that required for the main frame. The mounting 7 may be further compacted for transportation or shipment by swinging the support arm |03 along the side of the boom 50 and then turning the entire boomv assembly about the post 53 to a position wherein it overlies the main frame.

I claim:

A mounting for rock drills, comprising a portable frame,a. pressure uid operated jack on an end portion of the frame, a rotatable support member on the opposite end portion of the portable frame, a pressure fluid operated brake on the frame for controlling the rotation of the support member, a boom pivotally connected to the support member for movement in a vertical plane, a support arm pivotally connected to the boom for transverse swinging movement, pres.

sure fluid operated means connected to the support member and the boom for effecting pivotal 4movement of the boom, a pump on the frame for pumping pressure fluid to the uid operated means, a pneumatically driven motor on the frame for driving the pump, control means on the boom located adjacent the free end thereof for controlling the flow of pressure fluid to the brake and the boom actuating means, and means for-stopping themotor when the discharge pressure of the pump exceeds a predetermined order.

` GEORGE M. DICK.

REFERENCES yCITED Number y Name Date 902,417 Lane Oct. 27, 1908 2,060,814 Lewis Nov. 17, 1936 2,123,897 v Holmes July 19, 1938 2,253,626 Joy Aug. 26, 1941 2,331,179 Fossum 1 Oct. 5, 1943 2,389,553 Sellars Nov. 20, 1945 2,491,273 Lehner 1 Dec. 13, 1949 2,500,931 Curtis Mar. 21, 1950 2,500,932 Curtis et al. Mar. 21, 1950 2,532,079 Beltz Nov. 28, 1950 FOREIGN PATENTS Number Country Date Denmark Apr. 4, 1932 

